Because very basic game theory explains that if they give up on the frontier unilaterally, competitors will capitalize on that rather than also give up. Hence the request for regulation.
And while their alignment is less than good, there are criteria by which it is the best available (eg no hugging face-scale attack on their end) So it is strictly worse to allow a competitor with worse alignment to take the lead.
And while their alignment is less than good, there are criteria by which it is the best available (eg no hugging face-scale attack on their end) So it is strictly worse to allow a competitor with worse alignment to take the lead.